Halo: Combat Evolved
The game that started it all. Play a mix of Slayer and objective game types in Halo: Combat Evolved for the first time on Xbox Live. 4v4.

Halo 2 Classic
It’s back. A mix of the most popular Team Slayer and objective game types from the original Halo 2. 4v4.

Halo 3
A selection of fan-favorite Team Slayer and objective game types from Halo 3. 4v4.

Halo 4
A mix of Team Slayer and objective game types from Halo 4, on a selection of small to medium-sized maps. 5v5.

Team Hardcore
A collection of tournament-approved game types from Halo 2 and Halo 3. The Battle Rifle is your primary weapon. 4v4.

Halo eSports
The official Halo eSports playlist. 4v4.

SWAT (Rotational)
Aim for the head! A collection of SWAT game types on our favorite maps from Halo 2, Halo 3, Halo 4, and Halo 2: Anniversary. Players have no shields and are equipped with rifles. 4v4.

Also, via Frank (for you 2v2/Team Doubles fans, and fans of other gametypes):

Originally Posted by Stinkles

Dun worry there will be weekly rotational lists and consistent updates.

I love the complaints, I don't know what everyone expected. Did people seriously think there would be several playlists for their preferred size/gametype per game?

I think you read me wrong. Not complaining. It's the opposite. I'm spoiled for choice, so many decent sounding playlists, despite the lack of dedicated Objective. I'm really excited to revisit a bunch of maps again.

I just hope they don't screw things up by including Heavies or AR starts in BTB.

Blaze and I were talking about this last night, but why isn't there a dedicated 2v2 playlist for HCE on small maps?

For a lot of people (myself included, when I wasn't at a LAN), that was the quintessential HCE MP experience. Instead we're suck with a shitty rotational playlist that may or may not show up after a few months for maybe a week or two, and will inevitably include shitty H4 stuff that nobody is interested in playing. Yay?

We all know that the H4 playlist might as well not even be there, as it's going to have the lowest population by a huge margin. Unfortunately, I fear that 343 will be too prideful to remove it and put something meaningful there instead, so we'll be stuck with at least one useless playlist that just sits around taking up space.

Blaze and I were talking about this last night, but why isn't there a dedicated 2v2 playlist for HCE on small maps?

For a lot of people (myself included, when I wasn't at a LAN), that was the quintessential HCE MP experience. Instead we're suck with a shitty rotational playlist that may or may not show up after a few months for maybe a week or two, and will inevitably include shitty H4 stuff that nobody is interested in playing. Yay?

We all know that the H4 playlist might as well not even be there, as it's going to have the lowest population by a huge margin. Unfortunately, I fear that 343 will be too prideful to remove it and put something meaningful there instead, so we'll be stuck with at least one useless playlist that just sits around taking up space.

So much this. I started typing something rational like this, but then landed on just using my snarky response instead. Halo 1's sweet spot (on most of the good maps) was not 4 v 4. The pistol is too powerful for that. Also, having the one solitary 4 v 4 playlist really does open us up for some serious gametype shenanigans.